JP2003173627A - Apparatus and method for reproducing data and digital camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and method for reproducing data by repairing an unreadable place on the surface of a recording medium on a file system for reproducing it and to provide a digital camera for repairing a defective place on the recording medium on the file system for reproducing it. <P>SOLUTION: The digital camera 1 has a control part 24 provided with a function as a repair means which constitutes a new extent with the logical address of a sector next to a defective sector as a leading address after retrieving the defective sector in the case of reading a series of data such as picture data, etc. Then, the digital camera 1 describes the leading address of the new extent to the allocation descriptor of a file entry ICB in file information to be recorded at the rear stage of a data file constituted based on a UDF. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data reproducing apparatus, a data reproducing method, and a digital camera, and more particularly to a data reproducing apparatus and a data reproducing apparatus for restoring and reading data even if a recording portion where the data cannot be read occurs on a recording medium. The present invention relates to a data reproducing method and a digital camera.

[0002]

2. Description of the Related Art So-called C to which optical reading is applied
A disc-shaped recording medium such as a D (Compact Disc) (hereinafter referred to as an optical disc) has a large storage capacity and can be randomly accessed. Also, the optical reading is
Since it is non-contact, there is no danger of head crash or the like, and there is no wear or damage to the head and medium due to reading, as compared with a contact type recording medium such as a magnetic tape. Also, since the surface of the disk is sturdy, there is little risk of accidental data loss. Thus, the optical disc having many advantages is an excellent recording medium as a memory around a computer and in data production and data storage.

In recent years, CD-R (Compact Disc-Recor)
dable) and CD-RW (Compact Disc-Rewritable). Some of such recording / reproducing apparatuses include CD-
Some can easily write to all standard formats used in compact discs such as ROM, CD-ROM / XA, CD-I, and CD-DA. Further, such a recordable optical disc has been mounted on an electronic device in place of a conventional magnetic tape, magnetic disc, or the like and used for recording and / or reproducing data.

[0004] For example, as an electronic device equipped with a writable optical disc, there is a consumer image capturing / recording device such as a digital camera. Some of these are capable of capturing not only still images but also moving images for a long time. The moving image data that has been captured and recorded can be reproduced through an application having a moving image reproducing function in the apparatus main body, computer equipment such as a PC, or the like.

Recording and / or recording using such an optical disc
Or, as a standard for reproduction, the US OSTA (Optica
There is a UDF (Universal Disk Format) defined by the Storage Technology Association.

In the file system based on the UDF additional recording method, packet writing is used when writing data. What is packet writing?
Link block in front of data and four run-in (Ru
Writing is performed as a packet structure having an n-In) area and two run-out areas at the end of the data. In addition to the data area, 7 blocks are used as a junction recording area (hereinafter referred to as a linking area) which is a junction area between adjacent packets.

In UDF, instead of directly managing the management information of directories and files as actual recording positions (real addresses), a file identification descriptor (FID; File I) is used.
dentifier Descriptor), virtual allocation table (VA
T; Virtual Allocation Table), file entry I
It is indirectly managed by using a CB (File Entry Information Control Block) or the like.

[0008] VAT is a technique for treating a recording medium as if it were able to update or reproduce data by accessing an arbitrary address on the medium when recording by the additional recording method. The real address where the file is actually recorded and the virtual address corresponding to this real address are managed as a correspondence table.

That is, the UDF indirectly references the position information of directories and files. The position of VAT can be freely arranged in the packet structure, but VAT ICB (Virtual Allocation Ta
The ble Information Control Block) is determined so as to be always arranged at a position returned by the linking area from the last sector recorded on the recording medium. Therefore, in UDF, the virtual address can be converted into the real address by first reading the VAT indicated by this VAT ICB.

Further, in UDF, a set of logical sector columns in which data is written / read is called an extent, and one file is divided into a plurality of extents for management. The start address of each extent is stored as file information,
It is added following the data entity along with the file system information to be updated.

As a recording system for recording information on an optical disc such as a CD-R or CD-RW, a disc at once (DAO) system for recording a series of data as one recording stream or a track at There is a once (TAO: Track At Once) method and a packet writing method for sequentially recording a series of data as necessary.

For example, in a case where a still image data or moving image data is recorded in a recording medium each time a picture is taken, such as a digital camera, the TAO method causes a large amount of management data overhead. However, the user recording area defined as the format of the optical disk cannot be effectively used. Therefore, a packet writing method most suitable for sequential recording is usually used.

For example, MPEG (Moving Picture Exper)
ts Group) format packet recording method that sequentially records moving image data files on an optical disc,
User data that constitutes one file is divided into multiple extents and recorded, all extents are recorded, and then these multiple extents are handled as continuous user data that constitutes one file. It is managed by additionally recording a file management information block called ICB.

As described above, by combining the UDF file system and the packet writing method, for example, moving image data continuously photographed by the image pickup device is divided into a plurality of pieces and recorded on a recording medium such as a CD-R or a CD-RW. It is possible to record and handle this as one moving image data file by UDF.

[0015]

By the way, although the surface of an optical disk such as a CD-R or a CD-RW is relatively tough, the storage condition of the optical disk itself after recording, for example, a recording surface and a label surface ( External data such as scratches on the surface opposite to the recording surface may make it impossible to read the recorded data in this portion, or it may take a very long time to read the data.

In particular, when the data portion where the recorded file cannot be read (damaged physical sector) is a part of the data having a large data capacity, for example, it is photographed for a long time. If the extent is in the middle of a stream of moving image data, the data reproducing device cannot reproduce this series of moving image data, or even if it can reproduce the moving image data, the reproduction is interrupted when this data point is reached. Not only makes the playback operation uncomfortable, but it may also lose valuable data.

In order to avoid such a situation, there is also taken a measure to prevent interruption of the reproducing operation by skipping the entire series of moving image data including physical sectors that cannot be read by the data reproducing apparatus. However, the skip processing is also inconvenient for the user in that the entire captured important moving image data cannot be reproduced.

Therefore, the present invention has been proposed in view of such a conventional situation, and a data reproducing apparatus for recovering an unreadable portion on the surface of a recording medium on a file system and reproducing it. An object of the present invention is to provide a data reproducing method and a digital camera capable of reproducing a defective portion on a recording medium by repairing the defective portion on a file system.

[0019]

In order to achieve the above-mentioned object, a data reproducing apparatus according to the present invention includes a real address indicating a recording position of a sector of a series of data recorded as a sector on a recording medium. In a data reproducing device that manages a series of data in a virtual recording space based on a virtual allocation table showing the correspondence with virtual addresses assigned to each sector so that a series of data is virtually continuous, a sector is a predetermined sector Read-out means for reading out for each set, discriminating means for discriminating whether or not the sector set includes a defective sector, repairing means for repairing a sector set including a defective sector, and sectors in the repairing means according to the discrimination result by the discriminating means. And a data restoration control means for controlling restoration of the set.

In such a data reproducing apparatus, the discriminating means discriminates the defective sector, and the restoring means restores the sector set including the defective sector. In particular, the repairing unit repairs the sector set including the defective sector by removing the defective sector from the virtual recording space and registering the sector set as a separate sector set in the virtual recording space.

Further, it is preferable that the data reproducing apparatus comprises a storage means for storing the start address of the sector set including the defective sector and the start address of a series of data including the sector set in association with each other. Further, the series of data is real-time data, and in particular, moving image data of MPEG format is used.

In order to achieve the above-mentioned object, the data reproducing method according to the present invention is such that a series of data recorded as a sector on a recording medium has a real address indicating a recording position of the sector and a series of data. In a data reproducing method that manages a series of data in a virtual recording space based on a virtual allocation table indicating correspondence with virtual addresses assigned to each sector so as to be virtually continuous, a sector is read for each predetermined sector set. The reading step, the determination step of determining whether or not the sector set includes a defective sector, the repair step of repairing the sector set including the defective sector, and the repair of the sector set in the repair step according to the determination result of the determination step. And a data restoration control step for controlling.

In such a data reproducing method, a defective sector is discriminated in the discriminating step, and a sector set including the defective sector is restored in the repairing step. In particular, in the repairing step, defective sectors are excluded from the virtual recording space, and the sector sets are registered in the virtual recording space as separate sector sets, so that the sector sets including the defective sectors are repaired.

Further, the data reproducing method according to the present invention has a storage step of storing the start address of the sector set including the defective sector and the start address of a series of data including the sector set in the storage means in association with each other. It is preferable. Further, the series of data is real-time data, and in particular, moving image data of MPEG format is used.

In order to achieve the above-mentioned object, the digital camera according to the present invention has a series of data recorded as a sector on a recording medium in which a real address indicating a recording position of the sector and a series of data are virtually. In a digital camera that manages a series of data in a virtual recording space based on a virtual allocation table that indicates correspondence with virtual addresses that are consecutively assigned to each sector, an image capturing unit that captures a subject and captured image data An image processing unit for processing, a recording / reproducing unit for recording and / or reproducing a sector for each predetermined sector set, a discriminating unit for discriminating whether or not the sector set includes a defective sector, and a sector set for including a defective sector. A repairing unit for repairing, and a data repairing control unit for controlling repairing of the sector set in the repairing unit according to the determination result of the determining unit .

In such a digital camera, the discriminating means discriminates the defective sector and the repairing means restores the sector set including the defective sector. In particular, the repairing unit repairs the sector set including the defective sector by removing the defective sector from the virtual recording space and registering the sector set as a separate sector set in the virtual recording space.

Further, it is preferable that the digital camera comprises a storage means for storing the start address of the sector set including the defective sector and the start address of a series of data including the sector set in association with each other. Further, the series of data is real-time data, and in particular, moving image data of MPEG format is used.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Specific examples of the present invention will be described below.
A detailed description will be given with reference to the drawings.

A digital camera shown as a configuration example of a specific example of the present invention is a recording medium, especially a C, based on a file system conforming to UDF (Universal Disk Format).
D-R (Compact Disc-Recordable), CD-RW (Com
A disk-shaped recording medium such as a pact Disc-Rewritable) is provided with a driver that records and / or reproduces a data file by an additional recording method, has an imaging unit, and the imaging unit images an object, It is a digital camera capable of recording and / or reproducing this image data on a recording medium.
As the digital camera, specifically, a digital still camera capable of capturing and recording still images and non-compressed still images, a digital camcorder and a digital video recorder capable of capturing and recording moving images, and a digital camera having both functions. I can give you a camera.

The moving image data is M in this example.
It is based on the PEG (Moving Picture Experts Group) format, and an example of using a CD-R as a recording medium will be described.

When reproducing the image data recorded on the CD-R, if there is a sector that cannot be read due to scratches on the CD-R recording surface or the label surface, this digital camera will be set to a sector set (hereinafter referred to as a sector set). , Extent.) Includes a bad sector that cannot be read, and if it contains a bad sector, the extent that contains this bad sector is repaired and a moving image that cannot be read is read. The data is reproducible. Specifically, this digital camera can reproduce moving image data including a defective sector by extracting the defective sector and excluding the defective sector from a logical recording space that is virtually configured. I have to.

The data restoration processing of this digital camera will be described below with reference to FIGS. 1 and 2. First, in step S1, a memory for storing an unreproducible sector and an MPEG moving image data pack including this sector is initialized. When there are a plurality of moving image files recorded on the CD-R, in step S2, the file management information of the first moving image file is acquired, and the leading end of the first extent of the MPEG moving image data divided and recorded in a plurality of extents. From the logical sector corresponding to the address, the sectors are read out in a sequential order within the extent (step S3).

At this time, although the read operation is normally completed once, the read operation may fail (read error) due to a physical defective sector or scratches after recording. With respect to the read error sector, the read operation may be performed again (hereinafter, referred to as a read retry operation), and the data may be successfully read. Therefore, the retry is repeated a predetermined number of times.

If the read fails even by this read retry operation, that is, if a read error is detected in step S4, the process proceeds to step S5.
This sector is regarded as a non-readable defective sector, the head address of the MPEG moving image data pack including this defective sector is specified, and is registered in the memory in association with the moving image file of this MPEG image data. In this specific example, M
The pack size of PEG moving image data is fixed.

If all the sectors in the first extent have been successfully read in step S4, the process proceeds to step S6, and it is determined whether or not there is a next extent. If there is a subsequent extent, step S7
Then, the read retry operation is performed on the subsequent extent. When the read error is detected, the process of step S5 is executed.

Further, in step S8, another MPE
If it is determined that G moving image data exists, step S
In 9, the file management information of the moving image file of another MPEG moving image data is acquired, and recorded from a sector corresponding to the leading address of the first extent of this other MPEG moving image data, which is divided and recorded in a plurality of extents.
Sectors are read out in the sequential order within the extent (step S3).

Thereafter, a series of defective sector detection steps from step S3 to step S7 is executed to search all files on the CD-R for defective sectors.

The MPEG moving image data including the defective sector retrieved in the process of FIG. 1 is restored by the process shown in FIG. The digital camera shown as this specific example is
In response to the result of the processing shown in FIG. 1, in step S11, an MPEG moving image data pack including a defective sector,
That is, it is determined whether or not there is a file that needs to be repaired. If there is no file that needs to be restored, proceed to step S12,
The repair process ends. At this time, for example, there may be a step of notifying the user that there is no file that needs to be repaired.

On the other hand, if there is an image file to be restored, the user is informed of this in step S13, and in step S14 the user is inquired whether or not to restore the moving image file that needs to be restored.

When it is instructed in step S15 that the repair is necessary, the repair process is executed in step S16. As the repair process, the file management information of this file including the defective sector based on the UDF, that is, the file entry ICB (File Entry Information C
By changing the ontrol Block) and re-recording, the neighboring sectors including the bad sector are virtually erased from this file. By this restoration processing, the reproduction processing unit of the digital camera does not read out the vicinity of the defective sector when reproducing the file. Details of this restoration processing will be described with reference to FIGS. 8 and 9.

When the repair is completed, the user is notified of the completion of the repair in step S17, and the process is terminated.

In the process shown in FIG. 2, a GUI (Graphical User Interface) displayed on the display unit of the digital camera or the like is used.
e) The search result may be reported to the user by a screen or the like or by voice. Further, in the process shown in FIG. 2, a step of inquiring of the user whether or not to repair the MPEG moving image data including the defective sector is provided, but the operation of steps S13 to S17 is inquired to the user. It can also be automatically executed without.

When the defective sector is found as a result of the defective sector search process shown in FIG. 1 by the above-mentioned restoration process, the digital camera shown in this specific example physically records all the information including the defective sector. By virtually erasing the defective sector portion from the file system without rewriting, the entire file can be played. Further, by the process shown in step S5, the digital camera can grasp the file name of the file including the defective sector and the MPEG moving image data including the defective sector.

The UDF (Un
iversal Disk Format) means CD-R, WORM (Wri
te-Once Read-Many Optical Disk), CD-R / RW
(Compact Disc-Recordable / Rewritable), MO (Mag
net Optical Disk), DVD (Digital Versatile Dis)
k) is one of the definitions for describing the character code of file names, file attributes, etc., that can be used for various media, such as OSTA (Optical Storage Technolo
gy Association).

That is, the UDF is a file system for the purpose of enabling data exchange on any operating system (OS). In the digital camera shown in this specific example, the UDF revision is used.
1.50 sequential recording (sequential writing)
The method is adopted.

In UDF, the main data structure is a file entry ICB (File Entry Information Control).
Block) is used. In UDF, all files and directories have their own ICB. The file storing the actual data such as the MPEG moving image data of this specific example is generally written before the ICB that defines it. Therefore, when the file is divided into a plurality of extents (data strings) and written, the ICB can include information regarding the extents.

In UDF, VAT (Virtual Allocation
Using a mapping table called Table, each file is assigned a sequential number for virtual reference as a virtual address. While the file system conforming to the international standard ISO9660 directly refers to each file or directory on the recording medium by the real address, UDF refers to the virtual address as described above. . The VAT can be located anywhere in the track, and the VAT is now referenced by the VAT ICB, which points to the VAT's location.

When the sequential recording method of UDF revision 1.50 is adopted, it is determined that the VAT ICB is always arranged at a position returned by the linking area from the last sector recorded on the recording medium.
The VAT ICB includes an extent list of VATs divided and arranged in a plurality of extents. Therefore, in UDF, even if a file is changed in some way, it is not necessary to change the entire series of file pointers, and only the final VAT ICB can be changed to reach the changed file.

As described above, in the UDF, by providing the VAT between the FID and the file entry ICB,
Even if the file entry ICB is rewritten, it can be treated as if the file entry ICB was virtually rewritten by replacing the address of the file entry ICB on the VAT.

Further, in the UDF-compliant file system, the write-once type recording medium can be treated as if it is a rewritable type recording medium.

Next, a specific configuration of a digital camera shown as a specific example of the present invention will be described with reference to FIG. This digital camera writes and reads data to and from a recording medium, and here,
CD-R is used as a recording medium.

The digital camera 1 includes an image pickup section 10 for picking up an image of a subject, an image signal calculation processing section (Image Signal Processor) 11 for converting an image signal from the image pickup section 10.
A display unit 12 that displays operation information for operating the digital camera 1, an image signal, and the like, and an OP (Optical) that writes and / or reads to / from a recording medium described later.
Pickup) section 13, RF processing section 14 for RF processing the read signal, servo signal processing section 15 for generating a servo signal from each signal from RF processing section 14, and based on the signals from servo signal processing section 15. Analog filter processing unit 16 for generating an analog signal for controlling each driver
A signal processing unit 17 that processes a read signal from a recording medium, which will be described later, a spindle driver 18 that controls the rotation of the spindle motor, a thread driver 19 that controls the operation of the sled motor, and an objective lens of the OP unit 13. A tracking driver 20 that swings and a focus driver 21 that controls the focus of the beam by moving the objective lens of the OP unit 13 in the vertical direction with respect to the disk-shaped recording medium.
And a spindle motor 2 for driving a disk-shaped recording medium
2, a sled motor 23 that moves the OP unit 13 in the radial direction of the recording medium, and a control unit 24 that controls each unit,
The captured image data is written to and the image data is read from the recording medium 25.

The image pickup section 10 includes a lens section 30 for taking in an image of a subject and a charge-coupled device (hereinafter
It is referred to as CCD. ) 31, a sampling / hold (hereinafter referred to as S / H) circuit 32, and an A / D conversion circuit 33 for converting an image signal into a digital signal. C
The CD 31 generates an image signal from the subject image from the lens unit 30 and supplies the generated image signal to the S / H circuit 32. The S / H circuit 32 samples and holds the image signal from the CCD 31, and then the A / D conversion circuit 33.
Supply to. The A / D conversion circuit 33 includes the S / H circuit 32.
The image signal from is converted into a digital signal and supplied to the image signal arithmetic processing unit 11.

The image signal arithmetic processing unit 11 is controlled by the CPU to respond to the digital image signal from the image pickup unit 10.
Image processing such as color standard conversion from RGB signals to color difference / luminance signals, white balance processing, γ correction, reduced image processing, and JPEG compression processing is performed. The processed image signal is supplied to the signal processing unit 17. Further, the image signal calculation processing section 11 supplies the processed image signal to the display section 12.

The display unit 12 is, for example, a liquid crystal display (LCD), and displays the image signal from the image signal processing calculation unit.

The OP (Optical Pickup) unit 13 includes an objective lens, a laser diode (LD), a laser diode driver, and a photo detect IC (Photo Detect I).
C), a half mirror, etc., and detects an optical signal and outputs it to the RF processing unit 14. Further, when recording on the recording medium 25, a blinking / driving signal (DECEFMW) of the laser from the signal processing unit 17 required for pit formation, a (write strategy) signal indicating the optimum value of laser intensity and blinking, and the like. Data is written to the recording medium 25 based on the above.

The RF processing section 14 samples and holds the signals of eight systems consisting of the beam signal, the side, and the main detected from the OP section 13, performs arithmetic processing, and performs predetermined processing among the signals of eight systems. Signal to FE (focus error), TE (tracking error), MIRR
(Mirror), ATIP (Absolute Time In Pregroov
e) Generate signals such as a read main signal. The RF processing unit 14 uses an FMDT (Frequency Mo
dulation data), FMCK (Frequency Modulation Cl)
ock), TE, and FE are output to the servo signal processing unit 15, and the optimum value (O) of the laser intensity detected by the trial writing is detected.
A PC (Optical Power Calibration) signal and a laser blinking / driving signal are output to the signal processing unit 17, and MIRR is output to the control unit 24.

The servo signal processing section 15 includes an RF processing section 14
FMDT (Frequency Modulation Data) from FM
CK (Frequency Modulation Clock), TE, and FE are input, a signal controlled by the control unit 24 to control various servos peculiar to the optical disc is generated, and output to the analog filter processing unit 16.

The analog filter processing section 16 generates an analog signal from various servo control signals from the servo signal processing section 15 and outputs it to the spindle driver 18, the thread driver 19, the tracking driver 20, and the focus driver 21.

The signal processing unit 17 is controlled by the control unit 24 to input the OPC and DECEFM from the RF processing unit 14, and perform CIRC decoding and encoding, write strategy, ADDr decoding, asymmetry calculation, and running OP.
Perform processing such as C. When writing data to the recording medium, signals such as a blinking / driving signal of the laser and a signal indicating the optimum value of the laser intensity are output to the OP unit 13.

The spindle driver 18 controls the rotation of the spindle motor 22 based on the signal from the analog filter processing section 16.

The sled driver 19 operates on the basis of the signal from the analog filter processing section 16 to sled motor 23.
Control the threading behavior of.

The tracking driver 20 swings the OP section 13 based on the signal from the analog filter processing section 16 to control the position of the beam spot irradiated on the disk surface of the recording medium 25.

The focus driver 21 controls the focus adjustment of the laser by moving the OP section 13 in the direction perpendicular to the disk surface of the recording medium 25 based on the signal from the analog filter processing section 16.

The spindle motor 22 rotates the recording medium based on the signal from the spindle driver 18.

The sled motor 23 performs the sled operation of the OP unit 13 based on the signal from the sled driver 19.

The control section 24 includes a program memory for storing programs and a DRAM for storing FID and VAT.
(Dynamic Random Access Memory), ROM, EPR
A non-volatile memory such as an OM and a CPU are provided to control the overall operation of the digital camera 1. Further, when a series of data is read, a sector that cannot be read (a defective sector) is searched and a process for restoring the file so that it can be read is controlled.

Specifically, the control unit 24 searches for a defective sector when reading a series of data such as image data,
It has a function as a repairing unit that forms a new extent with the logical address of the sector next to the defective sector as the start address. Further, the control unit 24 sets the start address of the new extent to the file entry ICB (File Entry Informati) of the file information recorded in the subsequent stage of the data file configured based on the UDF.
on control block) to control the processing for virtually erasing and reproducing all the data including the defective sector recorded on the recording medium 25 without physically rewriting it. .

Further, the control section 24 stores the start address of the extent including the defective sector and the start address of a series of data including the extent in association with each other in the DRAM and the non-volatile memory. In the DRAM, the correspondence between the VAT that is updated each time a file or directory is updated, added, deleted, etc., the start address of an extent including a defective sector, and the start address of a series of data including this extent is recorded in the digital camera 1. It is stored until just before the main power of is turned off. Further, the non-volatile memory continues to hold the contents stored in the DRAM until just before turning off while the main power of the digital camera 1 is off.

The recording medium 25 is a recording medium in which data is written and read based on a UDF-compliant file system. In this specific example, a CD-R (Compact Disc-Recordable) having a disc shape is used. To use.

In the digital camera 1 having the function as the digital camera configured as described above, the operation of each component when reading the signal recorded on the recording medium 25 will be described.

The light of the laser diode reflected from the disk surface of the recording medium 25 is read by the lens optical system of the OP section 13. The light from the lens optical system is PDIC
(Photo Detect IC) converts it into an electric signal, which is sampled and held in the RF processing unit 14,
Focus error (F
E), tracking error (TE), mirror (MIR
R), ATIP (Absolute Time In Pregroove), read main signal, and other signals are generated by arithmetic processing.

First, the focus error obtained by the RF processing unit 14 is the servo signal processing unit 15 (Digital Serv.
After the characteristics are adjusted by the (O Processor), it is input to the focus driver 21 through the analog filter processing unit 16 (Analog Filter Block). The focus driver 21 vertically moves the lens drive focus coil of the OP unit 13 (not shown) to correct the focus shift.

Similarly, the tracking error obtained by the RF processing unit 14 is determined by the servo signal processing unit 15 (Digital Se
The AC component is taken out by the rvo Processor) and subjected to digital filter processing. Then, it is input to the tracking driver 20 through the analog filter processing unit 16. The tracking driver 20 finely moves the lens driving tracking coil of the OP unit 13 in the radial direction to correct the tracking deviation.

Further, in the tracking error obtained by the RF processing unit 14, the servo signal processing unit 15 extracts the DC component and performs the digital filter processing. After that, it is input to the thread driver 19 through the analog filter processing unit 16. The sled driver 19 operates the sled motor to move the entire OP unit 13 in the radial direction of the recording medium, and corrects the sled operation deviation. During the seek operation, the sled motor is forcibly driven by intentionally applying the sled control voltage from the outside.

As described above, the tracking error AC
A tracking operation in which only the lens is slightly moved in the radial direction is performed based on the component, and a sled operation in which the entire OP unit 13 is moved in the radial direction is performed based on the DC component.

Since the detection signal (mirror) of the reflectance change of the recording medium output from the RF processing unit 14 is detected when the OP unit 13 crosses the track, the CPU currently counts the mirrors. Detection of the seek position and reading position of, and start and stop of the optical pickup operation.

The spindle motor 22 is controlled by ATIP.
(Absolute Time In Pregroove) process. Wobble written on the recording medium
In the meandering groove called the groove, 22.05 kH in the radial direction
Time information is recorded by FM modulation of ± 1 kHz at the center frequency of z. What is modulated is time information called ATIP (Absolute Time In Pregroove) that is Bi-Phase modulated.

When the focus and the tracking match, the RF processing section 14 extracts the wobble signal from a predetermined combination of the input 8 signals. FM demodulation and ATIP decoding are performed, and a clock signal (FMCK) corresponding to the center frequency and time information (FMDT) are extracted.

The FMDT includes the servo signal processing unit 15 (Serv
o Processor) is stored in a predetermined register classified as an absolute time position of the medium, that is, an address and other additional information. In response, the CPU
Read out via US.

At the time of reading operation, the RF processing unit 14 extracts a signal corresponding to a recording pit from a predetermined combination of 8 signals, performs equalizer processing, and then EFM (Ei
ghtto Fourteen Modulation) The signal format is supplied to the signal processing unit 17 as it is. In the signal processing unit 17, the CIRC
Decoding based on (Cross Interleave Reed-Solomon Code) is performed to obtain desired data.

Next, the write operation will be described.
In the writing operation, first, the pickup is moved to the lead-in area to read the ATIP information. Further, the portion of the special information 2 is read out from that, and the start position of the lead-in area is known. The start position is usually stored as time information. The information written in the special information 2 corresponds to the individual identification code of the recording medium.

In the recording medium reading device, the write strategy parameter corresponding to the individual identification code and other related parameters are stored in advance as a table. The write strategy is a technique for correcting a laser pulse at the time of writing in the time direction and the level direction for each pit so that the pit size after writing satisfies the standard. This correction parameter is prepared in advance for each recording medium.

Next, an OPC (Optical Power Calibration) operation for determining the optimum value of the laser output is performed.
While the write strategy described above is the detailed control of the laser for each writing pit, the OPC is an operation for calculating the overall optimum value. By performing OPC, the write setting value corresponding to the ideal read target value is obtained.

Data writing is performed by subjecting the compressed photographed image data prepared in the RAM to the CIRC or EFM encoding process in the signal processor, and then blinking / driving signal (DECEF) of the laser necessary for pit formation.
MW) and a (write strategy) signal indicating the optimum value of the laser intensity are input to the laser driver of the OP unit.
At this time, writing is performed at a predetermined position along the file system with the frame unit address obtained from the FMDT signal obtained by decoding ATIP as a reference. In the first writing, the lead-in area becomes about 20 in the later closing session.
Writing is started from a position where the Mbyte area is skipped.

Subsequently, when the digital camera 1 having the above-mentioned structure is used for photographing, the photographed image data is C
How the data is written in D-R will be described with reference to FIG.
FIG. 4 shows image data written in the recording medium 25 immediately after the (N + X) th image is captured after the Nth image is captured.

When photographing is performed, laser light is scanned spirally from the inner circumference to the outer circumference of the surface of the CD-R disk with the disk center as an axis, and the picked-up image data packet is additionally recorded as a pit.

Physical areas 100 and 101 indicate areas in which image data corresponding to the Nth sheet and the (N + X) th sheet are written, respectively. FIG. 4 shows that the Nth image data is written from the inner circumference of the disc and the (N + X) th image data is written from the outer circumference of the disc.

The structure of the packet data of the captured image written at this time will be described with reference to FIG. Volume 10
Reference numeral 2 indicates that the Nth to (N + X) th image data written in the recording space from the inner circumference side to the outer circumference side of the recording medium 25 are sequentially arranged and recorded in the virtual address space. 3 shows a virtual section (virtual partition) of the UDF in which the captured image data is written.

Therefore, the direction from the Nth image data 103 to the (N + X) th image data 104 corresponds to the track direction on the recording medium 25 that spirally travels from the inner side of the disc to the outer side. ing.

Then, the volume structure of the image data is schematically described in correspondence with the virtual address space.

Linking areas 105, 106, 10
Reference numerals 7 and 108 normally have an area of 7 blocks, and play the role of a so-called joint recording section when connecting packets to each other.

The segment 109 is the entity of the file containing the image data of the Nth image, and the segment 1
Reference numeral 10 is a substance of a file including image data of the (N + X) th image.

The segment 111 is a file entry ICB for the directory to which the substance of the file of the Nth image data included in the segment 109 belongs, and a file identification descriptor (F
ID) column is included. The file identification descriptor includes identification character string information for identifying a specific file.

The segment 112 is a file entry ICB for the directory to which the substance of the (N + X) th image data file included in the segment 110 belongs.
Only included. Further, the segment 113 includes a sequence of file identification descriptors. In this way, when the number of file identification descriptors is large, the segment 112
, And the segment 113, the file identification descriptor string is stored in a logical block different from the file entry ICB.

The segments 114 and 115 include a file entry IC containing the location of the file entity, file creation / update date / time information, authority information, and the like.
B (ICB; Information Control Block). The position of the file entry ICB can be specified by the above-mentioned file identification descriptor corresponding to the file entry ICB one to one. The correspondence between the two is
Usually, an address reference expression to the virtual space is used.

The segment 116 includes a UDF virtual allocation table (Virtual Allocation Table) and a virtual allocation table ICB (VAT ICB). These store information for associating the virtual address in the UDF virtual partition, which is the virtual address space, with the actual logical block address on the recording medium.
T and VAT ICB are updated by adding / changing the file entity.

The segment 117 contains the latest VAT regarding the packet data of the (N + X) th image captured last. The segment 118 and the subsequent segments represent unrecorded sectors of the recording medium 25.

Incidentally, FIG. 4 shows that the session including the photographed image data is not closed and can be additionally written.

In the UDF, when the data size of image data to be recorded is large, such as uncompressed still image data or moving image data with high resolution, the file can be divided into a plurality of extents and recorded. Extent
Is a sequence of consecutive logical sectors, UDF rev
In the sequential recording method of Ision 1.50, the data capacity included in one extent can be set to a variable length.
In this specific example, the data capacity of one extent is set to a variable length of 1 Mbyte at maximum according to the memory capacity of the working memory included in the control unit 24 of FIG. The address of the extent is represented by the logical sector number at the head of this extent. The logical sector numbers are assigned in ascending order.

In the digital camera shown as a specific example of the present invention, the main body of the data entity is MPEG moving image data or high-resolution still image data, so that the capacity of one data file is the extent defined here. In some cases, the data size exceeds the size to be described.

For example, the case where the series of MPEG streams shown in FIG. 5 is recorded on the optical disc will be described.
FIG. 5 particularly shows the outline of the data structure of the upper layer of the MPEG1 system stream.

As shown in FIG. 5, a series of MPEG moving image data is composed of a plurality of packets, and the pack at the beginning of the program has an information group called a system header that describes the outline of the entire stream. is doing. This system header is obligatory to be added to the first pack, but is optional in the second and subsequent packs. The stream starts with the pack header at the beginning and ends with an end code.

When the data substance recorded on the recording medium 25 is the MPEG1 system stream shown in FIG.
The virtual address space shown in FIG. 4 is as shown in FIG.

That is, a pack stream of an MPEG stream of a predetermined size is written from the segment 120. In FIG. 6, the MPEG stream is the MPEG pack sequence P.
a, Pb, Pc, Pd divided into segments 12
0, 121, 122, 123 are recorded. Following the MPEG stream data file, UDF management information regarding this file is written. Specifically, the directory entry ICB is in the segment 124, the file identification descriptor (FID) is in the segment 125, the file entry ICB is in the segment 126, the virtual allocation table (VAT) and the virtual allocation table ICB (VAT).
ICB) is written to segment 127.

In FIG. 6, between packets,
Linking areas 129, 130, 131, 132, 1
33 is provided. Although shown as a virtual address space in FIG. 6, UDF revision
With a CD-R conforming to 1.50, files such as moving image data are continuously recorded on a recording medium, and the sector size actually recorded is equal to the sector size at the virtual logical address. Therefore, the virtual address space shown in FIG. 6 corresponds to the actual recording area on the recording medium.

In the recording medium 25 recorded with the above-described data structure, the recording data of this portion is read by external damage such as scratches on the recording surface or the label surface (the surface opposite to the recording surface). Think of a case where you cannot get out. At this time, the relationship between the MPEG pack sequence recorded as an extent and the file entry ICB is schematically shown in FIG. FIG. 7 shows a state in which certain MPEG moving image data is separated and recorded in extents Ex ₁ , Ex ₂ , and Ex ₃ . Each extent shown in FIG. 7 corresponds to the MPEG pack sequence shown in FIG. In the recording area of the file entry ICB, the allocation descriptor following the header describes the address of the beginning of the extent, a list of all extents of the file stored in the recording medium 25, the date, the file attribute, and the like.

FIG. 8 shows an example in which there are two recording areas of unreadable packs as a result of the search shown in FIG.
As schematically shown in FIG. 8, there are unreadable pack rows P ₁ and P _{2 at} a recording position corresponding to a part of the extent Ex ₂ due to a defective sector caused by a scratch on the recording surface or the label surface. To do.

As a result, the extent Ex ₂ is composed of reproducible pack rows P _x , P _y and P _z and non-reproducible pack rows P ₁ and P ₂ as shown in the figure. Become.

In this case, in the restoration process shown in FIG. 2, the user is notified that there is a portion of the file on the recording medium that needs to be restored through the GUI screen (step S13 in FIG. 2), and the file The user is inquired whether or not to repair (step S14 in FIG. 2). This process can be omitted depending on the interface design.
That is, when an error location is detected, the digital camera 1
May automatically move to a repair process to repair the file.

When the repair processing is requested by the user, the repair processing is executed for all target files (step S16 in FIG. 2). The specific content of the restoration process is the change of the file entry ICB that is the UDF file management information as described above.

In the case of the MPEG moving image data file shown in FIG. 7, the unreadable pack string P ₁ and the pack string P ₂ of the extent Ex ₂ are excluded from the reproduction target of the file, and the remaining readable pack string P _x. , P _y and P _z are registered in the allocation descriptor of the file entry ICB as new extents Ex ₂ ′, Ex ₃ ′ and Ex ₄ ′.

[0113] As a result, as shown in FIG. 9, MPEG video data, in the file entry ICB extent Ex ₁ corresponding to the extent Ex ₁ and 'the extent Ex ₅ corresponding to the extent Ex _3',
A file having new extents Ex ₂ ′, Ex ₃ ′, and Ex ₄ ′ reconstructed from the extent Ex ₂ is managed by the corresponding allocation descriptor. In this restoration process, only the file entry ICB is updated, and the substance of the data is not updated. Therefore, the recording time and the recording capacity on the recording medium accompanying the process are small.

Therefore, according to the digital camera 1,
When a non-readable bad sector is found in the CD-R used as a recording medium, the bad sector portion is virtually erased from the file system without physically rewriting all the information including the bad sector. The entire file, excluding bad sectors, can be played back without any problems.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

For example, in the above-described specific example, the user interface for collectively inspecting all the MPEG moving image data recorded on the recording medium 25 has been exemplified, but in addition to this, a predetermined MPEG moving image is also used. It is also possible to employ an interface that, when a sector that cannot be read is detected during reproduction of data, notifies the user that the recovery is necessary after the reproduction and shifts to the recovery process.

The maximum capacity of the extent of the CD-R used in the digital camera shown as the present specific example is a design matter, and the type of recording medium used, for example, C
It can be changed by a D-R, a CD-RW, a DVD or the like. Therefore, the data capacity per extent or the like does not depend on the data format of the MPEG stream such as MPEG2 and MPEG4.

The present invention can be applied not only to the write-once recording system but also to the rewritable recording system, and the recording medium is not limited to CD-R, CD-RW, etc.
CD-R / RW (Compact Disc-Recordable / Rewritabl
e), DVD-RW (Digital Versatile Disk-Rewritabl
e), optical disks such as DVD-RAM, MO (MagnetOpt
It is possible to use a magneto-optical disk such as an optical disk), a so-called MD (Mini Disc).

[0119]

As described above in detail, in the data reproducing apparatus according to the present invention, a series of data recorded as a sector on a recording medium has a real address indicating a recording position of the sector and a series of data as virtual. In a data reproducing device that manages a series of data in a virtual recording space based on a virtual allocation table indicating correspondence with virtual addresses assigned to respective sectors so as to be sequentially continuous, a sector is read for each predetermined sector set. Means, discriminating means for discriminating whether or not the sector set includes a defective sector, repairing means for repairing the sector set including the defective sector, and controlling repair of the sector set in the repairing means according to the discrimination result by the discriminating means. Data recovery control means for

Therefore, according to the data reproducing apparatus of the present invention, even if a part of the data file becomes unreproducible due to a scratch or the like on the recording medium, the defective sector is virtually reproduced when the file is reproduced. By erasing, a series of data including a defective sector can be reproduced. Therefore, smooth reproduction can be performed without wasting redundant and unnecessary time each time a file including a defective sector is reproduced.

Further, according to the data reproducing apparatus of the present invention, it is possible to prevent the entire series of data from being unreproducible due to the defective sector.

Further, according to the data reproducing method of the present invention, the real address indicating the recording position of the sector of the series of data recorded as a sector on the recording medium and the series of data are virtually continuous. In the data reproducing method for managing a series of data in the virtual recording space based on the virtual allocation table showing the correspondence with the virtual address attached to,
Depending on the determination result in the reading step, a reading step of reading out the sector for each predetermined sector set, a determination step of determining whether or not the sector set includes a defective sector, a repair step of repairing the sector set including the defective sector, And a data restoration control step of controlling restoration of the sector set in the restoration step.

Therefore, according to the data reproducing method of the present invention, even if a part of the data file becomes unreproducible due to a scratch or the like on the recording medium, the defective sector is virtually reproduced when the file is reproduced. By erasing, a series of data including a defective sector can be reproduced. Therefore, smooth reproduction can be performed without wasting redundant and unnecessary time each time a file including a defective sector is reproduced.

Further, according to the data reproducing method of the present invention, it is possible to prevent all the series of data from being unreproducible due to the defective sector.

Furthermore, in the digital camera according to the present invention, the real address indicating the recording position of the sector of the series of data recorded as a sector on the recording medium and the series of data are virtually continuous in each sector. In a digital camera that manages a series of data in a virtual recording space based on a virtual allocation table showing the correspondence with the attached virtual address,
An image pickup means for picking up a subject, an image processing means for processing the picked-up image data, a recording / reproducing means for recording and / or reproducing a sector for each predetermined sector set, and whether or not the sector set includes a defective sector A discriminating means for discriminating, a repairing means for repairing a sector set including a defective sector, and a data restoration control means for controlling restoration of the sector set in the repairing means according to the discrimination result by the discriminating means.

Therefore, according to the digital camera of the present invention, even if a part of the data file becomes unreproducible due to a scratch or the like on the recording medium, the defective sector is virtually erased when the file is reproduced. By doing so, a series of data including a defective sector can be reproduced. Therefore, smooth reproduction can be performed without wasting redundant and unnecessary time each time a file including a defective sector is reproduced.

Further, according to the digital camera of the present invention, it is possible to prevent the entire series of data from becoming unreproducible due to the defective sector.

[Brief description of drawings]

FIG. 1 is a flowchart illustrating a defective sector search process of a data reproducing device shown as a specific example of the present invention.

FIG. 2 is a flowchart illustrating a defective sector repair process of the data reproducing apparatus shown as a specific example of the present invention.

FIG. 3 is a block diagram illustrating a configuration example of a digital camera shown as a specific example of the present invention.

FIG. 4 is a schematic diagram illustrating a virtual address space of data recorded by a digital camera shown as a specific example of the present invention.

FIG. 5 is a schematic diagram showing an outline of a data structure of an upper layer of an MPEG1 system stream.

FIG. 6 is a schematic diagram illustrating a virtual address space of data when an MPEG1 system stream is recorded on a recording medium by a digital camera shown as a specific example of the present invention.

FIG. 7 is a schematic diagram showing a relationship between an MPEG pack sequence and a file entry ICB.

FIG. 8 is a schematic diagram illustrating a defective sector in an extent.

FIG. 9 is a schematic diagram showing a relationship between MPEG moving image data in which a defective sector is repaired and a newly registered file entry ICB.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 digital camera, 10 imaging device, 11 image signal arithmetic processing section, 12 display section, 13 OP section, 14 RF
Processing unit, 15 Servo signal processing unit, 16 Analog filter processing unit, 17 Signal processing unit, 18 Spindle driver, 19 Thread driver, 20 Tracking driver, 21 Focus driver, 22 Spindle motor, 23 Thread motor, 24 Control unit, 25
Recording medium, 30 Lens part, 31 Charge coupled device, 32
S / H circuit, 33 A / D conversion circuit

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) H04N 5/92 H04N 5/92 HF Term (Reference) 5C052 AA02 AB02 AB09 CC06 5C053 GB37 HB10 KA24 LA01 5D044 AB05 AB07 BC04 CC04 DE38 DE62 DE64 EF05 GK08 5D090 AA01 BB03 BB04 CC01 CC14 DD03 FF27

Claims (18)

[Claims] 1. Correspondence between a real address indicating a recording position of a sector of a series of data recorded as a sector on a recording medium and a virtual address assigned to each sector so that the series of data is virtually continuous. In a data reproducing device that manages the series of data in the virtual recording space based on the virtual allocation table showing, read means for reading out every predetermined sector set and whether the sector set includes a defective sector or not It is characterized by further comprising: a discriminating means, a repairing means for repairing a sector set including the defective sector, and a data restoration control means for controlling restoration of the sector set by the repairing means in accordance with a discrimination result by the discriminating means. Data playback device. 2. The data reproducing according to claim 1, wherein the repairing means removes the defective sector from the virtual recording space and registers the sector set in the virtual recording space as a separate sector set. apparatus. 3. The data according to claim 1, further comprising a storage unit that stores a start address of a sector set including the defective sector and a start address of a series of data including the sector set in association with each other. Playback device. 4. OSTA (Optical Storage Technology)
2. The data reproducing apparatus according to claim 1, wherein the file is managed according to a universal disc format defined by Association. 5. The data reproducing apparatus according to claim 1, wherein the series of data is real-time data. 6. The series of data is MPEG (Moving).
6. The data reproducing device according to claim 5, wherein the data reproducing device is moving picture data of Picture Experts Group format. 7. A correspondence between a real address indicating a recording position of a sector of a series of data recorded as a sector on a recording medium and a virtual address assigned to each sector so that the series of data is virtually continuous. In the data reproducing method for managing the series of data in the virtual recording space based on the virtual allocation table showing the above, a reading step of reading the sector for each predetermined sector set, and whether the sector set includes a defective sector or not And a data repair control step of controlling repair of the sector set in the repair step according to the determination result in the distinguishing step. Characteristic data reproduction method. 8. The data according to claim 7, wherein, in the repairing step, the defective sector is excluded from the virtual recording space, and the sector set is registered in the virtual recording space as a separate sector set. How to play. 9. A storage step of storing in a storage means a start address of a sector set including the defective sector and a start address of a series of data including the sector set in association with each other. The data reproduction method described. 10. OSTA (Optical Storage Technolo)
8. The data reproducing method according to claim 7, wherein the file is managed in accordance with a universal disc format defined by the Gy Association). 11. The data reproducing method according to claim 7, wherein the series of data is real-time data. 12. The series of data is MPEG (Movi
12. A data reproducing method according to claim 11, wherein the data reproducing method is moving picture data of ng Picture Experts Group) format. 13. A correspondence between a real address indicating a recording position of a sector of a series of data recorded as a sector on a recording medium and a virtual address assigned to each sector so that the series of data is virtually continuous. In a digital camera that manages the above series of data in a virtual recording space based on a virtual allocation table showing, an image pickup means for picking up an object, an image processing means for processing the picked-up image data, and the sector as a predetermined sector. Recording / reproducing means for recording and / or reproducing for each set, discriminating means for discriminating whether or not the sector set includes a defective sector, repairing means for repairing a sector set including the defective sector, and the discriminating means in the discriminating means. And a data restoration control unit for controlling restoration of the sector set in the restoration unit according to a determination result. camera. 14. The digital camera according to claim 13, wherein the repairing means removes the defective sector from the virtual recording space and registers the sector set in the virtual recording space as a separate sector set. . 15. The digital storage device according to claim 13, further comprising storage means for storing a start address of a sector set including the defective sector and a start address of a series of data including the sector set in association with each other. camera. 16. OSTA (Optical Storage Technolo)
14. The digital camera according to claim 13, wherein the file is managed according to a universal disk format defined by the Gy Association). 17. The digital camera according to claim 13, wherein the series of data is real-time data. 18. The sequence of data is MPEG (Movi
18. The digital camera according to claim 17, wherein the digital camera is moving image data in the ng Picture Experts Group) format.